iPad iPad Mini crashing apps after JB

I don't know if this is the right place, but I'm having some issues with my iPad mini. I was using iOS 6.0.3 with jailbreak and everything was fine. Did a DFU restore to 7.0.4 and then jailbroke it. After that, Safari crashed just as soon as i've clicked, and so did Keynote and iMovie (They're not pirate apps).
Ok, I thought something went wrong when JB so i've restored and did it again and everything was fine til some hours later, the problem persisted.
I've nothing yet installed jailbreak related, so I don't know what it could be. Safari crashes does not appear on error log, neither does iMovie. Keynote has some error log, bug I can't understand what it is.

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